Officers smashed the network as 8.5kg of drugs were being trafficked from Glasgow to Dundee.

During the November 2012 bust, police also found 1.2kg of cocaine worth £61,500 and more than £28,000 in cash in Dundee’s Whitfield area.

Gray was yesterday jailed for six years, Quinn for five years and three months and Barnie for three years after they were convicted of dealing heroin and cocaine in their home city of Dundee.

Claire Breen, 31, also from Dundee, was ordered to carry out 300 hours of unpaid work for supplying drugs.

Seven other members of the group were jailed for their involvement last year, including 31-year-old gang leader Niki Hunter, who was locked up for six-and-a-half years.

Detective Inspector Scott Thomson is part of the Organised Crime and Counter Terrorism Unit involved in the bust, codenamed Operation Athens, aimed at snaring the Whitfield crime gang.

He said: “This was a complex investigation that required carefully planning and execution to secure the necessary evidence and make the arrests.

“There is no doubt this operation is a major success against disrupting the supplying of cocaine and heroin in Tayside.”

Gray, Quinn and Barnie were sentenced at the High Court in Glasgow yesterday.

In July 2013, Dundee dealer Hunter was jailed at the High Court in Edinburgh for supplying heroin. The court heard the dad of three was in charge of the Dundee end of the deal.

Sean Massie, 22, from Whitfield, was also found guilty and jailed for three-and-a-half years.

Last year, courier Raymond Cossar, 27, of Lambhill, Glasgow, and Sean Campbell, 25, of Fintry, Dundee, were each jailed for three years after admitting their involvement.

William Forbes, 36, from Broughty Ferry, was sentenced to six years and four months, while 51-year-old John Longworth – also of Broughty Ferry – and another Glasgow man, Mark Hutchison, 35, were both jailed for two years and nine months.

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